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([2a01:e0a:e17:9700:16d2:7456:6634:9626]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3821ae313e3sm899050f8f.94.2024.11.14.01.13.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Nov 2024 01:13:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1731575627; x=1732180427; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=JwIuN+J3+bzup2NaOf8IKQF5a5sBeZ+ThACkLSBKsdk=; b=ktjc1JS2vTGXS1o/SYNGxLHL6KMdLxlBnEbr+ekVuqQj3ZRvQQ4sI7fI4tZH8096s5 NZb2FmHDTZJ6vf1nzbBi9lnqxOQbETlREErZxtXXH4SQ9t0I6/er4dOMLX/MPuLl48qu i5qyEnvJArDzYTdYGka8gvlRp6neY4R/NvQMf2KSCpbZE00E+IZGLpExq0kpfYw29iiV 8y0yCOK2Si/0RnlxbPcmzviKtRAbI6/qPfDCpgBO22Yc9isoNHmZNTu29rDZC7nsZrUX GwwY9DpNXtOsVfVfNWAyemByM6KdVVRJwP3j8MoGHKYNgHk0ay8qLpUh04sHuL9KhTSF MqnA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731575627; x=1732180427; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=JwIuN+J3+bzup2NaOf8IKQF5a5sBeZ+ThACkLSBKsdk=; b=RhJ9hCL+ngKnij+tKRaI5H618nB2EwQqSZ4Aj1PFQNtDd5l0tAVepELc3bbnCId4g9 7OFNC6UZqVsxsepDcXMjxaarny6Zw9l4PuOP9ybVXN5jOgjg8FZc0mH8tV4egNpBlQMo 0ZTVZ/Vfs8TY6jK6F8HXhoz+a17wKAr+f6fabeUPvxHwd2LlkH1mdk8Nh0+EumfgJG09 1BBCBbLICXHNE9bE8tCruJYLZmW4PY6mnjgLB78beo6k8P7k6POGOPs8IPBVm0AfHkjQ gZjX6eGgpxVBXMU0gPCjQNn5rgGmBsGpy34izWFYVwOwxr/MrEwHtaRYxg3R1S6fKjIy TueQ== X-Forwarded-Encrypted: i=1; AJvYcCXKAjjgnrCt3A4L5GPlIenoz6hJuvPh/eA6dqbyPwZIun1UBejZfwtDgSb2lRG3A6kOJNKU5SRhwY3P@nongnu.org X-Gm-Message-State: AOJu0YyDZxBJUdS6hlhhgqHkx9sCTgnYUPIOUNKej5eUtNBrOG0wfdOk flBFxEo6B3vXFAIjH0/ej8uiyUxbPCGqV4fCnfkwOyJl8ZtIPhwGKFTRDLKelhs= X-Google-Smtp-Source: AGHT+IG2QlQXLwSlFrWfUBOuz6VZJ2rI+ELe1TPnuRdPTlkw+gnDWl3BUF9BnNS18hECoSGMaBmpaQ== X-Received: by 2002:a05:6000:2b08:b0:382:1e06:fb0 with SMTP id ffacd0b85a97d-3821e0612ecmr316365f8f.56.1731575626746; Thu, 14 Nov 2024 01:13:46 -0800 (PST) From: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= To: qemu-riscv@nongnu.org, Palmer Dabbelt , Alistair Francis , Bin Meng Cc: =?UTF-8?q?Cl=C3=A9ment=20L=C3=A9ger?= , Weiwei Li , Daniel Henrique Barboza , Liu Zhiwei , Ved Shanbhogue , Atish Patra , qemu-devel@nongnu.org Subject: [PATCH v5 3/9] target/riscv: Implement Ssdbltrp sret, mret and mnret behavior Date: Thu, 14 Nov 2024 10:13:24 +0100 Message-ID: <20241114091332.108811-4-cleger@rivosinc.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241114091332.108811-1-cleger@rivosinc.com> References: <20241114091332.108811-1-cleger@rivosinc.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::42b; envelope-from=cleger@rivosinc.com; helo=mail-wr1-x42b.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @rivosinc-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1731575806894116600 When the Ssdbltrp extension is enabled, SSTATUS.SDT field is cleared when executing sret. When executing mret/mnret, SSTATUS.SDT is cleared when returning to U, VS or VU and VSSTATUS.SDT is cleared when returning to VU from HS. Signed-off-by: Cl=C3=A9ment L=C3=A9ger Reviewed-by: Alistair Francis --- target/riscv/op_helper.c | 35 ++++++++++++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-) diff --git a/target/riscv/op_helper.c b/target/riscv/op_helper.c index 180886f32a..dabc74de39 100644 --- a/target/riscv/op_helper.c +++ b/target/riscv/op_helper.c @@ -287,6 +287,18 @@ target_ulong helper_sret(CPURISCVState *env) get_field(mstatus, MSTATUS_SPIE)); mstatus =3D set_field(mstatus, MSTATUS_SPIE, 1); mstatus =3D set_field(mstatus, MSTATUS_SPP, PRV_U); + + if (riscv_cpu_cfg(env)->ext_ssdbltrp) { + if (riscv_has_ext(env, RVH)) { + target_ulong prev_vu =3D get_field(env->hstatus, HSTATUS_SPV) = && + prev_priv =3D=3D PRV_U; + /* Returning to VU from HS, vsstatus.sdt =3D 0 */ + if (!env->virt_enabled && prev_vu) { + env->vsstatus =3D set_field(env->vsstatus, MSTATUS_SDT, 0); + } + } + mstatus =3D set_field(mstatus, MSTATUS_SDT, 0); + } if (env->priv_ver >=3D PRIV_VERSION_1_12_0) { mstatus =3D set_field(mstatus, MSTATUS_MPRV, 0); } @@ -297,7 +309,6 @@ target_ulong helper_sret(CPURISCVState *env) target_ulong hstatus =3D env->hstatus; =20 prev_virt =3D get_field(hstatus, HSTATUS_SPV); - hstatus =3D set_field(hstatus, HSTATUS_SPV, 0); =20 env->hstatus =3D hstatus; @@ -328,6 +339,22 @@ static void check_ret_from_m_mode(CPURISCVState *env, = target_ulong retpc, riscv_raise_exception(env, RISCV_EXCP_INST_ACCESS_FAULT, GETPC()); } } +static target_ulong ssdbltrp_mxret(CPURISCVState *env, target_ulong mstatu= s, + target_ulong prev_priv, + target_ulong prev_virt) +{ + /* If returning to U, VS or VU, sstatus.sdt =3D 0 */ + if (prev_priv =3D=3D PRV_U || (prev_virt && + (prev_priv =3D=3D PRV_S || prev_priv =3D=3D PRV_U))) { + mstatus =3D set_field(mstatus, MSTATUS_SDT, 0); + /* If returning to VU, vsstatus.sdt =3D 0 */ + if (prev_virt && prev_priv =3D=3D PRV_U) { + env->vsstatus =3D set_field(env->vsstatus, MSTATUS_SDT, 0); + } + } + + return mstatus; +} =20 target_ulong helper_mret(CPURISCVState *env) { @@ -345,6 +372,9 @@ target_ulong helper_mret(CPURISCVState *env) mstatus =3D set_field(mstatus, MSTATUS_MPP, riscv_has_ext(env, RVU) ? PRV_U : PRV_M); mstatus =3D set_field(mstatus, MSTATUS_MPV, 0); + if (riscv_cpu_cfg(env)->ext_ssdbltrp) { + mstatus =3D ssdbltrp_mxret(env, mstatus, prev_priv, prev_virt); + } if ((env->priv_ver >=3D PRIV_VERSION_1_12_0) && (prev_priv !=3D PRV_M)= ) { mstatus =3D set_field(mstatus, MSTATUS_MPRV, 0); } @@ -378,6 +408,9 @@ target_ulong helper_mnret(CPURISCVState *env) if (prev_priv < PRV_M) { env->mstatus =3D set_field(env->mstatus, MSTATUS_MPRV, false); } + if (riscv_cpu_cfg(env)->ext_ssdbltrp) { + env->mstatus =3D ssdbltrp_mxret(env, env->mstatus, prev_priv, prev= _virt); + } =20 if (riscv_has_ext(env, RVH) && prev_virt) { riscv_cpu_swap_hypervisor_regs(env); --=20 2.45.2